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Hydraulic control valve for a longitudinally adjustable connecting rod with an end-face control piston

a technology of hydraulic control valve and connecting rod, which is applied in the direction of valve operating means/release devices, machines/engines, mechanical equipment, etc., can solve the problems of unintentional spontaneous ignition of the piston engine, component damage in the engine, and the spark ignition engine not running smoothly, so as to reduce the installation space required for the control valve, increase the operational reliability, and reduce the production cost

Active Publication Date: 2022-11-01
IWIS MOTORSYSTEME GMBH & CO KG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to an improved hydraulic control valve for a longitudinally adjustable connecting rod. This valve has a control slide with a control piston and a control pressure surface that can be subjected to hydraulic control pressure. The control slide has a simple structure that allows for reliable operation and precise control of the connecting rod. The control slide can be easily mounted using a single opening in the connecting rod, reducing manufacturing costs. The control slide also allows for direct transmission of the axial motion of the valve to the outlet valves, ensuring accurate operation. Overall, the invention simplifies the installation and operation of the hydraulic control valve for a longitudinally adjustable connecting rod.

Problems solved by technology

The thermal efficiency increases as the compression ratio rises, but too high a compression ratio can lead to unintentional spontaneous ignition of the piston engine.
This early combustion does not only lead to spark ignition engines not running smoothly and so-called knocking of the engine, but can also lead to component damage in the engine.
In particular in the development of modern piston engines, the installation space for such connecting rods is limited both in the longitudinal direction of the connecting rod (axially) as well as radially.
The installation space in the crankshaft direction is limited by the bearing width and the spacing of the counterweights.
In addition, the fatigue strength of the materials used is problematic in view of the high internal pressures in the adjustment mechanism employed.
A further problem is the provision of the hydraulic control device with the various inlet, return flow, and supply ducts for engine oil and the necessary check and control valves which additionally weaken the components of the connecting rod.

Method used

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  • Hydraulic control valve for a longitudinally adjustable connecting rod with an end-face control piston
  • Hydraulic control valve for a longitudinally adjustable connecting rod with an end-face control piston
  • Hydraulic control valve for a longitudinally adjustable connecting rod with an end-face control piston

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Embodiment Construction

[0029]Longitudinally adjustable connecting rod 1 shown in the schematic view in FIG. 1 comprises two connecting rod members 2, 3 telescopically movable relative to one another. Lower connecting rod member 2, which is arranged at the bottom in the illustration of longitudinally adjustable connecting rod 1 in FIG. 1, comprises a connecting rod large end 4 with which longitudinally adjustable connecting rod 1 is mounted on the crankshaft (not shown) of the piston engine. For this purpose, a bearing shell 5 is further arranged on lower connecting rod member 2 and together with the lower region of lower connecting rod 2, which is also configured like a bearing shell, forms connecting rod large end 4. Bearing shell 5 and lower connecting rod member 2 are connected to one another by way of connecting rod screws (shown schematically as dashed lines). Upper connecting rod member 3 comprises a connecting rod head 6 with a connecting rod small end 7 which receives the piston pin (not shown) of...

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Abstract

A longitudinally adjustable connecting rod for a piston engine, where the connecting rod includes a first connecting rod end for receiving a piston pin and a second connecting rod end for receiving a crankshaft journal, where the distance between the piston pin and the crankshaft journal is adjustable in the longitudinal direction (A) of the connecting rod by way of a hydraulic control device with a hydraulic control valve. The hydraulic control valve comprises a control cylinder and a control slide which is guided in a slidable manner in the control cylinder and which can be pressurized, and at least one outlet valve which can be actuated by the control slide. The control slide comprises a control piston which is arranged on the end face, with a control pressure surface which can be subjected to the hydraulic control pressure and which defines a control pressure chamber in the control cylinder. The use of such a longitudinally adjustable connecting rod with a hydraulic control device in a piston engine as well as a corresponding piston engine is also provided.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a National Stage of International patent application PCT / AT2019 / 060335, filed on Oct. 8, 2019, which claims priority to foreign Austrian patent application No. AT A50871 / 2018, filed on Oct. 8, 2018, the disclosures of which are incorporated by reference in their entirety.FIELD OF THE INVENTION[0002]The present invention relates to a longitudinally adjustable connecting rod for a piston engine, where the connecting rod comprises a first connecting rod end for receiving a piston pin and a second connecting rod end for receiving a crankshaft journal, where the distance between the piston pin and the crankshaft journal is adjustable in the longitudinal direction of the connecting rod by way of a hydraulic control device, and where the hydraulic control device comprises a control cylinder and a control slide which is guided in a slidable manner in the control cylinder and which can be pressurized. The invention further rela...

Claims

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Application Information

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IPC IPC(8): F02B75/04
CPCF02B75/045F16C7/06F02D15/02F16K31/12F16K31/44F16K31/52425F16K31/52416
Inventor HELLER, MALTEARENS, KAIRIBA, ZOLTÁNBODENSTEINER, MARTINLATZ, STEFFENKOMETTER, BERNHARDMELDE-TUCZAI, HELMUT
Owner IWIS MOTORSYSTEME GMBH & CO KG
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